"Alan Gould" wrote in message
...
In article , John Edgar
writes
Does anyone know the differences between frost, air frost and ground
frost and the implication each has for plants.

As I understand it, air frost is freezing or frozen mist and ground
frost is freezing or frozen dew. Both are more dangerous if wind is
blowing and both vary in volume with humidity.

I thought air frost occurs when the temperature of the air falls below zero
and ground frost occurs when the temperature of the soil falls below zero.

Franz